What is the difference between photoshop and ps?

Photoshop and PS are actually abbreviations of the same software, both of which refer to Adobe Photoshop, an image processing software launched by Adobe Company. So Photoshop is no different from PS.

Sometimes people use the abbreviation "PS" instead of "Photoshop" because "PS" is shorter and easier to use in spoken English and short messages. In the Chinese environment, "PS" is often translated into the abbreviation of "Photoshop".

So Photoshop and PS are essentially different names and abbreviations of the same software, and there is no essential difference.